VNC - Control your PC with your Mac
iBook G3 500 - hard drive too small for my large collection of TV AVI files.
Compaq PC - with lots of storage, always on (with BitTorrent running), lots of AVI files.
Bedroom, two rooms away from PC, has TV plugged into PC video. Hate having to run down the hall to change TV shows to watch, or pause a movie.
Load VNC onto my PC and iBook. Sit in my bedroom, control my PC wirelessly with my iBook. It runs pretty quick too! No serious lag! Love it!